text: //What do you think the following code will output?
  
  let nanArray = [NaN];
  
  console.log(nanArray[0] === NaN);
  //I believe NaN is the only value in JS that doesn't equal itself
  //so the output would be 'false'
  
  //How can you reliably test if a value is NaN?
  //by using the method isNaN()